Look on page 3 and catalog number 30250
Link here: Adapter Plug
You do have a 20 amp plug on the XS1200, an amplifier which has been discontinued.
It's there for a reason!
There is adaptor plugs to 15 amps but I cannot recommend their usage.
You should try and find a 20 amp plug, most commercial buildings do have 20 amp receptacles.
If this is for use in your home, guarantee that you have a 20 amp breaker and wiring and that the outlet is dedicated, without other circuits running to that same breaker, you can replace your outlet with a 15/20 amp outlet.
When practicing at a friends house, we first use a outlet tester (easily obtained at Home Depot, Ace hardware etc...) and checked the outlet, that it is correct.
Next while one person is at the breaker box, check to see just which outlets
or lights that breaker controls.
During practice we make sure that the other outlets are not used, so as to not take power from the Amplifiers etc..
If you are lucky you will have two breakers and outlets in a room, though most houses will put one bedroom on a single Breaker.
I rent but if I owned a home which I am trying to do now, I would have dedicated power run to the Rehearsal space within it.
I am lucky that our Drummer works for an Electrical Contractor.
Tread carefully when dealing with AC power!
Depending on what other Amplifiers and Equipment that you have, you may want to consider a Power Distro.
Yeah, this amp (and 2 or 3 others....lower power) will only be used at small/medium gigs in bars/clubs. I just may have to look into a distro.
I had no idea the xs1200 was discontinued....it's still listed as current on the crown site. Hmm....I just got mine brand new and haven't even powered it up yet.